Haier MRV5-H - Page 91

88
Digital Tube
Indication
on Main Unit
Failure Code Denition Failure Description Remarks
26-3
Outdoor unit and VP-box
communication failure
The searched VP-box quantity is less than set quantity for
continuous 5 minutes.
Resumable
26-4
The searched VP-box quantity is more than set quantity for
continuous 5 minutes.
27-0 Oil temp too high protection(Toil1)
Toil ≥ 248 °F(120 °C) continuous 2 s exceeds the set value
after shutdown alarm; the alarm condition after stopping the
oil temperature below 10 °F, automatic recovery after 2min
50s.Four times an hour to conrm the fault
Once
conrmed
un-resumable
27-1 Oil temp too high protection(Toil2)
28 High pressure sensor Pd failure
AD value is below 11 (open circuit) or over 1012 (short circuit)
for 30s
Resumable
29 Low pressure sensor Ps failure
AD value is below 11 (open circuit) or over 1012 (short circuit)
for 30s.
If Tao ≥ 104 °F(40°C), short circuit fault is not detected.
30-0 High pressure switch HPS1 failure
If disconnected for 2s continuously, alarm. If alarm 3 times in
an hour, the failure is conrmed.
Once
conrmed
un-resumable
30-1 High pressure switch HPS2 failure
32-0
Heat exchanger outlet temp. Tsco
failure
If AD value is below 11(open circuit) or over 1012(short
circuit) fo 60 seconds, alarm, sensor has no alarm when
abnormal in heating mode.
Resumable
32-1
Liquid pipe SC temp. of subcooler
Tliqsc failure
33-0
EEPROM failure
AT24C04 EEPROM communication failure
Once
conrmed
un-resumable
33-2
AT24C04 EEPROM data check failure (model code, check
sun etc.)
33-3
AT24C04 EEPROM data check failure (data beyond limit,
reverse sequence etc.)
34-.0
Discharging temp too high protection
(Td1)
If Td ≥ 248 °F(120 °C) continues over 2 s, then stop and
alarm; the alarm condition after stopping the oil temperature
below 50 °F(10 °C), automatic recovery after 2min50s. Four
times an hour to conrm the fault
34-1
Discharging temp too high protection
(Td2)
35-0 4-way valve reversign failure
If below conditions are met for more than 10 seconds after the
4-way valve is energized for 10 minutes, reversing is nished.
This outdoor compressor is running normally Td1 or Td2-
Tdef1 ≥ 50 °F(10 °C) & Toci-Tao ≤ 25 °F & Pd-Ps ≥ 44 psi,
otherwise failure is conrmed if the system alarms more than
3 times in one hour.
35-1 4-way valve reversin failure
If there is 4-way valve of sub unit not electried after main unit
heating detection starts up for 20 min, Failure is conrmed if
detection occurs more than 2 times in one hour.
36-0 Oil temp too low protection (Toil1)
In normal operation,if Toil < CT+ 50 °F(10 °C) for continuous
5 minutes,the unit is stopped and alarmed 2 minutes and 50 s
later, then is resumed automatically. If it occurs 3 times in an
hour, the failure is conrmed.
36-1 Oil temp too low protection (Toil2)
39-0
Low pressure sensor Ps too low
protection
After compressor is running (except for residual operation),
if in cooling, Ps < 1 psi or in heating, Ps < 7 psi for continuous
5 minutes, alarm and stop. 2 minutes and 50 s later, resume
automatically. If it occurs 3 times in an hour, the failure is
conrmed.
39-1
Compression ratio too high
protection
After compressor is running, compression ratio ε ˃ 10.0 for
continuous 5 minutes, stop and alarm. 2 minutes and 50 s
later, resume automatically. If it occurs 4 times in an hour, the
failure is conrmed.
40
High pressure sensor Pd too high
protection
If Pd ≥ 602 psi, alarm and stop, 2 minutes and 50 s later,
resume automatically. If it occurs 3 times in an hour, the
failure is conrmed.
Once
conrmed
un-resumable